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Liability for Unpaid Claims and Claim Adjustment Expenses - Rollforward of Claims Liability (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Policy liabilities and unpaid claims balance as of January 1, $ 331,703 $ 233,438
Less: liabilities of policy-holder account balances, gross (801) (5,419)
Less: non-insurance warranty benefit claim liabilities (10,785) (30,664)
Gross liabilities for unpaid losses and loss adjustment expenses 320,117 197,355
Net balance as of January 1, short duration 154,412 83,945
Incurred (short duration) related to:    
Current year 81,563 50,013
Prior years 1,161 (36)
Total incurred 82,724 49,977
Paid (short duration) related to:    
Current year 42,706 36,498
Prior years 6,686 1,914
Total paid 49,392 38,412
Gross liabilities for unpaid losses and loss adjustment expenses 386,009 220,671
Plus: liabilities of policy-holder account balances, gross 273 5,120
Plus: non-insurance warranty benefit claim liabilities 7,595 25,532
Policy liabilities and unpaid claims balance as of March 31, 393,877 251,323
Short duration    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Reinsurance recoverable for unpaid claims and claims adjustments, beginning balance (165,129) (113,163)
Paid (short duration) related to:    
Net balance as of March 31, short duration 187,744 95,510
Reinsurance recoverable for unpaid claims and claims adjustments, ending balance 197,607 124,375
Other lines    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Reinsurance recoverable for unpaid claims and claims adjustments, beginning balance (576) (247)
Paid (short duration) related to:    
Reinsurance recoverable for unpaid claims and claims adjustments, ending balance $ 658 $ 786